Automatic printing telegraphy system



0t 1.8, 1938. w. G. H. F-1NcH AUTOMATIC PRINTING T111111111111111111-SYSTEMl 5 .ES-En- Original Filed June 24, 1956 Patented Oct. 18, 1938UN-iran s TA-rl-:s

PATENr 2,133,811 OFFICE I AUTOMATIC PRINTING TELEGBAPHY SYSTEM williamG. n. Einen, New York, N. Y. original application June 2 4, 193s, sel-m1No.

86,902. Divided and a 193s, senil No. 93,11

this application yAugust 1,

, romains '(cl. 11a-4)' My invention. relates to telecommunicationsystemsand more .particularly relates vto novel apparatus for andmethods of high speed automatic printing telegraph ,operation betweenremote points over telephone lines.

`This present invention is a continuation in part of my parentapplication Serial No.v 65,869, filed February 26, 1936, which maturedinto Patent No. 2,047,863 and is a division of my co-pending applicationSerial N6. 86,902, filed June 24, 1936.-

Modern high speed printing telegraph systems operate with a Baudot or veunit code.- A continuous tape is successively punched with apredetermined combination of holes for each character. It is thepractice to pass the tape through apparatus having five mechanicalfeelers which in turn operate contactors connected to contact plates ona mechanical distributor. chanical distributor, as is well known in thetelegraphy art, comprises la rotating arm for suc cessively contactingthe contact platesto transmit coded impulses in succession. Theoperation of mechanical distributors materially limits the speed oftransmission of printing telegraph signals.

The printing telegraph systems employing I mechanical distributorseither operate over a telegraph wire utilizing direct currentenerglzation or modulate a radio frequency carrier for transmitting theIsuccessive impulses of the coded combination to remote radio stations.For many commercial services, particularly news services, it is highlydesirable to transmit to the main'oillce a message from as near to thescene of action as practicable. Various proposals have been.

made to utilize the vast telephone system network for rapid andeconomical and portable operation between the main dice and out in thefield. None of the proposed systems for portably operating an automatictelegraphysystem over telephone lines have, to my knowledge, beensuccessful, particularly since the telephone companies cannot permit anyinterconnection by a subscriber .to its lines unless special precautionsand circuit balancing connections are used and a twenty-four hour 'perday lease is made. -The use of telegraph lines or radio systems forautomatic telegraphy is not feasible 'for portable intercommunicationwith the main ofilce. In' accordance with my present invention, Icontemplate ltransmitting the telegraphy Signals to the central oiiicefrom any telephone subscriber station. A telephone call is putthrough tothe central otlice and the ltelegraph unit is operated on apay-as-you-use basis. The principle of coupling to the ltelephonecircuit without physical interconnection thereto forms the basis of the.

parent application hereinabove referred to. The electrical couplingresides in utilizing a solenoid in optimum coupling relationship withthe inducsystem.

tion coil of the phone box, and a similar coupling v Aarrangement isemployedat the receiving station. The companion application Serial No.`

86,902 discloses how the telegraphy signals may be used to modulate anaudio carrier'irequency which is in turn transmitted to thecetralstationindividually or with a multiplex carrier communication system whereintelepicture signals are simultaneously transmitted.` y

The Apresent invention resides in utilizing a plurality of individualtones or audio frequencies sufllciently spaced so that they maybeindividually transmitted to correspond to the individualcodedvcombinations of the Baudot or other veunit code, and received andselectively ltered at the receiving station to operate a suitableautomaticprinting mechanism. The code combinations for each character"are transmitted simul-` A further object of. my invention is toprovidenovel apparatus for and method of portable 'operation over a printingtelegraph system employing telephone lines as the medium of transfmission and without physical interconnection thereto.

, These'and other objects of my invention will b ecome apparent in thefollowing description taken in connection with the drawing which is aschematic electrical diagram :cfa preferred embodiment of a five-unitprinting telegraph system 'operating over a'telephone line.

In carrying out my invention I employ an individual tone or audiofrequency corresponding with a predetermined position of each impressionof the coded combinations as punched in a paper ,tape. units which arevariously combined v to form 'I'he well known Baudet code contains vethirty-two characters in a manner well known in the art. A tape isgenerally punched with holes in ve rows corresponding to the particularcharacter to be transmitted. The preparation of the punched tape, thecharacter of the code combination or the number of -code units employedform no part of my present invention vand mayI -be varied in variousways. For purposes of illustration I use a :tive-unit code system.

The tape` lll is moved at a predetermined rate through the tapeselecting mechanism Il by the stepping mechanism I2. The portion of theused tape I3 is shown dotted in rolled form within the steppingmechanism I2. The selector mechanism II contains iive mechanicalAfeelers which operate contactors to electrically close correspondingcircuits in accordance with the punchings of the perforated tape. Sincesuch selecting mechanism is well known in the art, I have merelyschematically illustrated the selector II by ve armatures I4 andcorresponding contacts I5. It is to be understood that theelectricalcircuit between any set of contacts I4-I5 is closed in accordance withthe'actuation of the mechanical feelers in correspondence with thepunchings on the perforated tape.

An individual tone generator is associated with each contactor set I4-I5having, in one arrangement, the following spaced frequencies, 250

cycles, 600 cycles, 1000 cycles, 1500 cycles and 2200 cycles. AV primarywinding I6 on the coupling transformer -I'I is used for each set ofcontactors and the associated tone generator. The

tone generator, the contactor vI4--I5 and the primary winding I6 of eachset are respectively connected in series including a ground returnVcause corresponding induced tone signals in the secondary winding I8'which are impressed'upon the amplier 20 through the compensationnetwork I9. The signalsowing across secondary winding I8 representdifferent combinations of the audio frequency currents in accordancewith the combinations on the perforated tape for the character beingtransmitted. After .a predetermined interval corresponding to theperiodfor transmitting each character automatically stepping mechanism I2 willadvance the tape one position to present to the selector mechanism theperforations for the next character to be transmitted and acorresponding combination of the plurality of tones will be induced uponsecondary winding I8 rand be amplified and flow through the couplingsolenoid 2|.

Contactors 22-23 illustrated in the stepping I mechanism I2 areJactuated preferably between transmissions of each tape character duringthe advancement of the tape I0 through the selector'mechanism.Contactors 22-23 are accordingly connected once for each charactertransmitted to connect the 100 cycle tone generator to the primarywinding 24 of the coupling transformer I 1. A 100 cycle signal ofpredeterinined duration will accordingly be induced across secondarywinding I8 and ow through the solenoid 2l. The 100 cycle note impulserepresents the stepping signal ,and printing impulse for the receiverstation aswill be hereinafter described.

The printing telegraphy signals of my present invention are transmittedacross the telephone line 25 'without physical interconnection theretoby the coupling solenoid 2| at the telephone sta-` tion 26`. Theoperator telephones from a nearby telephone station 26 and an operativeconnecferred to above. The optimum coupling Acondition of solenoid 2I isa coaxial alignment between solenoid 2I and induction coil 29. Theprinting telegraphy signals induced across the telephone line 25 owthrough the induction coil 30 connected within the phone box 2Iassociated with the telephone receiving station 2'I. VA solenoid 32 ismounted upon the receiver phone box 3| in optimum coupling relationshipwith the induction coil30 therein. The solenoid 32 picksup theelectromagnetic signals emanating from induction coil 30gand introducesthem to the audio frequency amplifier 33. The output of amplifier 33 isconnected to the primary Winding 34 of the receiver coupling transformer35. The signals at the primary winding 34 correspond to the telegraphysignals at the secondary winding I8 of the transmitter couplingtransformer I1. Where it is necessary to correct for a non-linearfrequency characteristic of transmission between the transmittertransformer winding I8 and theireceiver transformer winding 34 acompensation network I9is .preferably introduced in the transmittercircuit as illus-` trated. The vcompensation network I 9 is designed inaccordance with principles disclosed in the hereinabove referred toapplications for smoothing out the frequency characteristic oftransmission across the telephone system.

A plurality of secondary windings 36 on transformer 35 correspond to theprimary windings I6 ofV transformer I1 and are respectively connectedtoband-pass filter networks 31 for selectively passingpredeterminedfrequencies. Each filter is designed to pass only the particularfrequency corresponding .to one of the tone transmitter generators.Accordingly, the lters 31 are correspondingly designed to transmit 250cycles, 500 cycles; 1000 cycles, 1500 cycles, and 2200 cycles,corresponding to the predetermined positions of the code combinationbeing transmitted from the perforated tape I0. The output of the filters31 are connected V*to relay solenoids 38 which actuate correspondingrelay armatures 39 operating upon corresponding contacts 4I). The relaycontactors 38-48 are connected to an automatic printing mechanism 4Ischematically indicated and well known inthe telegraphy art. Theprintingmechanism 4I prints characters upon a tape 42 advancedtherethrough in accordance with the combinations of relay contactors39-40 which are closed before each printing impulse. The particularcombination of relay contactors 3 8-40 closed at any period correspondsexactlyto the selector contactors I4-I5 closedin accordance with theperforations on the tape III operating the mechanical feelers of theselecting mechanism II. 'I'he plurality of audio frequency currentstransmitted across the telephone line predetermine the simultaneous thevrelay solenoids 38 and the secondary windings 36 causes onlyapredtermined frequency impulse'to actuate corresponding solenoids.'I'he solenoids 38 preferably respond directly to the associated audiofrequency tone but may well be direct current solenoids if a 'suitablerectifier is used in conjunction therewith. These rectiaisaeii saidcurrents for electromagnetically inducing corresponding currents intoone of said induction coils. j

\2. In-a signalling system operable. by a signal tape and extending overa telephone line having ers are preferably of the rugged mineral typewhen the stepping contactors 22-23 are connected between transmissionsof the successive characters hereinabbve described. When the cycle noteis cyclically transmitted, the relay contacts 46-41 are closed tocorrespondingly actuatethe receiver stepping mechanism 48 as well asproducing a. printing impulse at the character upon the .tape-42 andalso to reset the printer 4i and associated relay to be responsive tothe next succeeding operation. The receiver stepping mechanism 48 ispreferably ofthe electromagnetic type operated by relay 48--4'L Theclosure of relay 4'6-41 in response to the stepping impulse from the 100cycle note is transmitted to the printer mechanism .4i by connectionleads 49-50. The impulse across leads 49-58 actuates the printingand'resetting mechanism of the printer 4| in a manner well known in theart.

The automatic printing telegraphy system of my present inventionfunctions by the transmission of a plurality of frequency impulseslcorresponding to' characters. to be transmitted. The signals aretransmitted over a telephone system `without physical interconnectionthereto pertactors for the stepping and printing impulses..

this separate signal may be dispensed with by sacricing one of the codecombinations of the thirty-two and using it as the advance impulse atthe end of each operation. Another method is to utilize a relay at thereceiving station responsive to all code'l combinations transmitted,4

that'is, by eliminating thc selective filter -44 for .the advance relay45 and employing a time delay mechanism so that the stepping andprinting operations at the receiver will occur after a predetermined.interval following the reception of each code combination. i

My present invention may take other forms without departing from itsspirit or scope and accordingly, Ido not intend to be limited except asset forth in the following claims.

I claim: f 1. Ina signalling system operable by a signal tape andextending over a telephone line having `a.' telephone box including aninduction co'l at each end: means for generating an audio frequencycurrent individual to each of the predetermined impulse Apositions ofthe signal tape, means for selecting combinations of said currentscontrollable by-said impulse positions; and means for transmitting saidcurrents, across said telephone line comprising a solenoid connected toprinting means.

a telephoneA box including an induction coil at each end: means forgenerating an audio frequency current individual to each oi' thevpredetermined'iinpulse .positions o f the signal tape, means forselecting combinations of said currents controllable by said impulsepositions corresponding to coded impulse combinations of characters tobe transmitted; means for stepping said tape through said selectingmeans at a predetermined rate; and means for transmitting said currentsacross `said telephone line comprising a solenoid connected to saidcurrents for electromagnetically inducing corresponding currents intoone of said induction coils.

3. In a printing telegraphy system'ope'rable by a signal tape andextendingover a telephone line having a telephone box including aninduction printing mechanism 4| to impress the selected;

determined impulse positions of the signal tape,

means for selecting combinations of said currents controllable by saidimpulse positions corresponding to coded impulse' combinations of'characters to be transmitted; means for stepping said tape through saidselecting. means at a predetermined rate, a stepping audio frequencycurrent source cyclically transmittable during each stepping operation;and means for transmitting said cup- `rents across said telephone linecomprising a.

solenoid connected to said currents for electromagnetically inducingcorresponding currents into one of said induction coils.

`4:. In a signalling system operable by a signal tape and extending overa telephone line having a telephone box including an induction coil ateach end: means forgenerating an audio frequency current individual toAe'acli of the predetermined impulse positions of the signal tape,

. `means for selecting combinations of said currents controllable bysaid impulse positions; means for transmitting said currents across saidtelephone line comprising a solenoid connected to said currents forelectromagnetically inducing corresponding currents into one of saidinduction coils; means for receiving said induced currents comprising asecond solenoidfor coacting with the receivingstation induction coil;and printing means comprising local circuits individual to each of saidlfrequency currents, means for electrically 4separating said receivedcurrents, individual to each of said local circuits forcondiictingpredetermined frequency current impulses to -said 5. In a signallingsystem operable by a tape and extending over a telephone line having atelephone box including an induction coil at each end: means forgenerating an audio-fresignal A quency current individual to each of theprev determined impulse positions of the signal tape,

`means for selecting combinations of said currer.. ;s

saidtape through said'selecting means at a predetermined rate; meansVi'or transmitting said currents acrosssaid telephone line comprising asolenoid connected to said currents for 'electromagnetically inducingcorresponding currents into one .of said inductioncoils; means forreceiving said induced currents comprising a second solenoid forcoactingwith the receiving station induction coil; and printing means comprisinglocal circuits individual to each of said frequencycurrents, means forelectrically separating said received currents, individual to each ofsaid local circuits for conducting predetermined frequency. currentimpulses to said Yprinting means. y

6. In a printing telegraphy system operable by a signal tape andextending over a telephone line having a telephone box including aninduction coil at each end: means for generating an audio frequencycurrent individual to each of the predetermined impulse positions of thesignal tape, meansfor selecting combinations of said currentscontrollable by said impulse positions correspondingY to coded impulsecombinations oi.' characters to be transmitted; means for steppingsaidttape through said selecting means at a predetermined rate, astepping audio frequency current source cyclically transmittable duringeach stepping operation; means for transmitting said currents acrosssaid telephone line comprising a solenoid connectedto said currents forelectromagnetically inducing corresponding currents into one of saidinduction coils; means for receiving said induced currents comprising asecond solenoid for coacting with the receiving stationinduction' coil;and printing means com-- determined impulse positions of the signaltape,

means for selecting combinations of said currents controllable by saidimpulse positions; means for transmitting `said currents across saidtelephone line `comprising a solenoid connected to said currents for.electromagnetically inducing corresponding currents into one of; saidinduction coils and-arrangeable coaxially with said one induction coil;means for receiving` said induced currents comprising a `second solenoidfor coacting with the receiving station induction coil; printing meanscomprising local circuits individual to each of said frequency currents,means for electrically separating said received currents,

mitting said currents across said telephone line I .comprising a.solenoid connected vto said currents for electromagneticaily inducingcorresponding currents into one oi.' said induction coilsand'arlrangeable coaxially with said one induction coil; meansforreceiving said inducedL currents comprising a second solenoid forcoacting withthe receiving station induction coil; printing meanscomprising local circuits individual to each of said'frequency currents,lter means for electrically separating said received currents,individual to each of said local circuits for conducting predetermined`frequency current impulses totsaid printing means; and means responsivetofysaid stepping frequency current for impressing a selected characterand resetting said printing means, f 9. In a printing telegraphy systemoperabl by' a signal tape and extending over a telephone line having atelephone box lincluding an induction coil at each end: means forgenerating signal tape, means for selecting combinations of saidcurrents controllable by said impulse positions corresponding vto codedimpulse combina,- tions of characters to be transmitted; means forstepping said tape througn said selecting means at a predetermined rate,a stepping audio frequency current source cyclically transmittableduring each stepping operation; means for transmitting said currentsacross said telephone line comprising va solenoid connected to saidcurrents for electromagnetically inducing corresponding currents intoone of `said* induction coils; and a compensation network connected insaid system for smoothing the" transmission frequency characteristicacross s aid solenoids and said telephne lines. y

10. In a printing `t'elegraphy system operable by a signal tape andextending over a telephone line having a telephone box including aninduction coil at each end: means for -generating an audio frequencycurrent individual to each of the predetermined impulse positions of thesignal tape, means for selecting combinations of v said currentscontrollable by said impulse posiindividualto each of said localcircuits for 'conl ducting predetermined frequency current im. pulsestosaid printing means; and means responsive to said stepping frequency.current for impressing a selected character and resetting said printingmeans.

8. In a printing teiegraphy system operable.

by a signal tapeand extending over a telephone line having a telephonebox including an induction coil at each end: means for generating anaudio frequency current individual to ea'ch 'of'the predeterminedimpulse positions of `the signal tape, means for selecting combinations.of said currents controllable by said impulse posi-` tionscorrespondingfto coded impulse combinal tions of characters to betransmitted; means for K stepping said tape throught said selectingmeans at a predetermined rate, a stepping audio frequency current sourcecyclically transmittable during each steppingl operation; means fortranstions corresponding to coded impulse combinations of characters tobe transmitted; means for stepping said tape through' said selectingmeans I at a predetermined rate. a stepping audio frequency currentsource cyclically transmittable during each stepping operation; meansfor trans- Amitting said currents across said'telephone line pulses tosaid printing means; means responsive to saidstepping frequency currentfor impressing a selectedY character and resetting said printing means;and a compensation network con- .nected in said system for smoothing thetrans-v G. H. FiNcH.

